src/common/font.c

#ifndef lint
static const char       RCSid[] = "$Id: font.c,v 2.21 2021/11/19 21:56:48 greg Exp $";
#endif
/*
 * Polygonal font handling routines
 */

#include "copyright.h"

#include <stdlib.h>

#include "paths.h"
#include "rtio.h"
#include "font.h"

#define galloc(nv)      (GLYPH *)malloc(sizeof(GLYPH)+2*sizeof(GORD)*(nv))

int     retainfonts = 0;                /* retain loaded fonts? */

static FONT     *fontlist = NULL;       /* list of loaded fonts */


FONT *
getfont(                        /* return font fname */
        char  *fname
)
{
        FILE  *fp;
        char  *pathname, *err = NULL;
        unsigned  wsum, hsum, ngly;
        int  gn, ngv, gv;
        GLYPH   *g;
        GORD  *gp;
        FONT  *f;

        for (f = fontlist; f != NULL; f = f->next)
                if (!strcmp(f->name, fname)) {
                        f->nref++;
                        return(f);
                }
                                                /* load the font file */
        if ((pathname = getpath(fname, getrlibpath(), R_OK)) == NULL) {
                fprintf(stderr, "cannot find font file \"%s\"\n", fname);
                return(NULL);
        }
        if ((fp = fopen(pathname, "r")) == NULL) {
                fprintf(stderr, "cannot open font file \"%s\"\n", pathname);
                return(NULL);
        }
        f = (FONT *)calloc(1, sizeof(FONT));
        if (f == NULL)
                goto memerr;
        strcpy(f->name, fname);
        f->nref = 1;
        wsum = hsum = ngly = 0;                 /* get each glyph */
        while ((ngv = fgetval(fp, 'i', (char *)&gn)) != EOF) {
                if (ngv == 0)
                        goto nonint;
                if (gn < 1 || gn > 255) {
                        err = "illegal";
                        goto fonterr;
                }
                if (f->fg[gn] != NULL) {
                        err = "duplicate";
                        goto fonterr;
                }
                if (fgetval(fp, 'i', (char *)&ngv) <= 0 ||
                                ngv < 0 || ngv > 32000) {
                        err = "bad # vertices for";
                        goto fonterr;
                }
                g = galloc(ngv);
                if (g == NULL)
                        goto memerr;
                g->nverts = ngv;
                g->left = g->right = g->top = g->bottom = 128;
                ngv *= 2;
                gp = gvlist(g);
                while (ngv--) {
                        if (fgetval(fp, 'i', (char *)&gv) <= 0 ||
                                        gv < 0 || gv > 255) {
                                err = "bad vertex for";
                                goto fonterr;
                        }
                        *gp++ = gv;
                        if (ngv & 1) {          /* follow x limits */
                                if (gv < g->left)
                                        g->left = gv;
                                else if (gv > g->right)
                                        g->right = gv;
                        } else {                /* follow y limits */
                                if (gv < g->bottom)
                                        g->bottom = gv;
                                else if (gv > g->top)
                                        g->top = gv;
                        }
                }
                if (g->right - g->left && g->top - g->bottom) {
                        ngly++;
                        wsum += g->right - g->left;
                        hsum += g->top - g->bottom;
                }
                f->fg[gn] = g;
        }
        fclose(fp);
        if (ngly) {
                f->mwidth = wsum / ngly;
                f->mheight = hsum / ngly;
        }
        f->next = fontlist;
        return(fontlist = f);
nonint:
        fprintf(stderr, "non-integer in font file \"%s\"\n", pathname);
        fclose(fp);
        return(NULL);
fonterr:
        fprintf(stderr, "%s character (%d) in font file \"%s\"\n",
                        err, gn, pathname);
        fclose(fp);
        return(NULL);
memerr:
        fprintf(stderr, "out of memory in getfont()\n");
        fclose(fp);
        return(NULL);
}


void
freefont(                       /* release a font (free all if NULL) */
        FONT *fnt
)
{
        FONT  head;
        FONT  *fl, *f;
        int  i;
                                        /* check reference count */
        if (fnt != NULL && ((fnt->nref-- > 1) | retainfonts))
                return;
        head.next = fontlist;
        fl = &head;
        while ((f = fl->next) != NULL)
                if ((fnt == NULL) | (fnt == f)) {
                        fl->next = f->next;
                        for (i = 0; i < 256; i++)
                                if (f->fg[i] != NULL)
                                        free((void *)f->fg[i]);
                        free((void *)f);
                } else
                        fl = f;
        fontlist = head.next;
}


int
uniftext(                       /* uniformly space text line */
        short   *sp,            /* returned character spacing */
        char  *tp,              /* text line */
        FONT  *f                /* font */
)
{
        int  linelen;

        linelen = *sp++ = 0;
        while (*tp)
                if (f->fg[*tp++&0xff] == NULL)
                        *sp++ = 0;
                else
                        linelen += *sp++ = 255;
        return(linelen);
}


int
squeeztext(             /* squeeze text line */
        short  *sp,                     /* returned character spacing */
        char  *tp,                      /* text line */
        FONT  *f,                       /* font */
        int  cis                        /* intercharacter spacing */
)
{
        int  linelen;
        GLYPH   *gp;

        linelen = 0;
        gp = NULL;
        while (*tp && (gp = f->fg[*tp++&0xff]) == NULL)
                *sp++ = 0;
        cis /= 2;
        *sp = cis;
        while (gp != NULL) {
                if (gp->nverts) {               /* regular character */
                        linelen += *sp++ += cis - gp->left;
                        *sp = gp->right + cis;
                } else {                        /* space */
                        linelen += *sp++;
                        *sp = f->mwidth;
                }
                gp = NULL;
                while (*tp && (gp = f->fg[*tp++&0xff]) == NULL) {
                        linelen += *sp++;
                        *sp = 0;
                }
        }
        linelen += *sp += cis;
        return(linelen);
}


int
proptext(               /* space line proportionally */
        short  *sp,                     /* returned character spacing */
        char  *tp,                      /* text line */
        FONT  *f,                       /* font */
        int  cis,                       /* target intercharacter spacing */
        int  nsi                        /* minimum number of spaces for indent */
)
{
        char  *end, *tab = NULL;
        GLYPH  *gp;
        short  *nsp;
        int  alen, len, width;
                                        /* start by squeezing it */
        squeeztext(sp, tp, f, cis);
                                        /* now, realign spacing */
        width = *sp++;
        while (*tp) {
                len = alen = 0;
                nsp = sp;
                for (end = tp; *end; end = tab) {
                        tab = end + 1;
                        alen += *nsp++;
                        if (f->fg[*end&0xff]) {
                                while ((gp = f->fg[*tab&0xff]) != NULL &&
                                                gp->nverts == 0) { /* tab in */
                                        alen += *nsp++;
                                        tab++;
                                }
                                len += tab - end;
                        }
                        if (nsi && tab - end > nsi)
                                break;
                }
                len *= f->mwidth + cis;         /* compute target length */
                width += len;
                len -= alen;                    /* necessary adjustment */
                while (sp < nsp) {
                        alen = len/(nsp-sp);
                        *sp++ += alen;
                        len -= alen;
                }
                tp = tab;
        }
        return(width);
}
Revision:	2.22
Committed:	Fri Nov 19 22:51:31 2021 UTC (2 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.21:	+17 -18 lines
Log Message:	refactor: made font load errors non-fatal
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.22	static const char RCSid[] = "$Id: font.c,v 2.21 2021/11/19 21:56:48 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Polygonal font handling routines
6			*/
7
8	greg	2.13	#include "copyright.h"
9	greg	2.12
10	schorsch	2.18	#include <stdlib.h>
11
12	greg	2.19	#include "paths.h"
13	schorsch	2.17	#include "rtio.h"
14	greg	2.1	#include "font.h"
15
16			#define galloc(nv) (GLYPH )malloc(sizeof(GLYPH)+2sizeof(GORD)*(nv))
17
18	greg	2.12	int retainfonts = 0; /* retain loaded fonts? */
19	greg	2.1
20			static FONT fontlist = NULL; / list of loaded fonts */
21
22
23			FONT *
24	greg	2.21	getfont( /* return font fname */
25			char *fname
26			)
27	greg	2.1	{
28			FILE *fp;
29	schorsch	2.17	char pathname, err = NULL;
30	greg	2.3	unsigned wsum, hsum, ngly;
31	greg	2.11	int gn, ngv, gv;
32	greg	2.21	GLYPH *g;
33	greg	2.1	GORD *gp;
34	greg	2.21	FONT *f;
35	greg	2.1
36			for (f = fontlist; f != NULL; f = f->next)
37	greg	2.12	if (!strcmp(f->name, fname)) {
38			f->nref++;
39	greg	2.1	return(f);
40	greg	2.12	}
41	greg	2.1	/* load the font file */
42	greg	2.14	if ((pathname = getpath(fname, getrlibpath(), R_OK)) == NULL) {
43	greg	2.22	fprintf(stderr, "cannot find font file \"%s\"\n", fname);
44			return(NULL);
45			}
46			if ((fp = fopen(pathname, "r")) == NULL) {
47			fprintf(stderr, "cannot open font file \"%s\"\n", pathname);
48			return(NULL);
49	greg	2.1	}
50			f = (FONT *)calloc(1, sizeof(FONT));
51			if (f == NULL)
52			goto memerr;
53	greg	2.22	strcpy(f->name, fname);
54	greg	2.12	f->nref = 1;
55			wsum = hsum = ngly = 0; /* get each glyph */
56			while ((ngv = fgetval(fp, 'i', (char *)&gn)) != EOF) {
57	greg	2.11	if (ngv == 0)
58	greg	2.1	goto nonint;
59	greg	2.3	if (gn < 1 \|\| gn > 255) {
60	greg	2.1	err = "illegal";
61			goto fonterr;
62			}
63			if (f->fg[gn] != NULL) {
64			err = "duplicate";
65			goto fonterr;
66			}
67	greg	2.12	if (fgetval(fp, 'i', (char *)&ngv) <= 0 \|\|
68			ngv < 0 \|\| ngv > 32000) {
69	greg	2.1	err = "bad # vertices for";
70			goto fonterr;
71			}
72			g = galloc(ngv);
73			if (g == NULL)
74			goto memerr;
75			g->nverts = ngv;
76	greg	2.2	g->left = g->right = g->top = g->bottom = 128;
77	greg	2.1	ngv *= 2;
78			gp = gvlist(g);
79			while (ngv--) {
80	greg	2.12	if (fgetval(fp, 'i', (char *)&gv) <= 0 \|\|
81			gv < 0 \|\| gv > 255) {
82	greg	2.1	err = "bad vertex for";
83			goto fonterr;
84			}
85			*gp++ = gv;
86	greg	2.2	if (ngv & 1) { /* follow x limits */
87			if (gv < g->left)
88			g->left = gv;
89			else if (gv > g->right)
90			g->right = gv;
91			} else { /* follow y limits */
92			if (gv < g->bottom)
93			g->bottom = gv;
94			else if (gv > g->top)
95			g->top = gv;
96			}
97	greg	2.1	}
98	greg	2.3	if (g->right - g->left && g->top - g->bottom) {
99			ngly++;
100			wsum += g->right - g->left;
101			hsum += g->top - g->bottom;
102			}
103	greg	2.1	f->fg[gn] = g;
104			}
105			fclose(fp);
106	greg	2.3	if (ngly) {
107			f->mwidth = wsum / ngly;
108			f->mheight = hsum / ngly;
109			}
110	greg	2.1	f->next = fontlist;
111			return(fontlist = f);
112			nonint:
113	greg	2.22	fprintf(stderr, "non-integer in font file \"%s\"\n", pathname);
114			fclose(fp);
115			return(NULL);
116	greg	2.1	fonterr:
117	greg	2.22	fprintf(stderr, "%s character (%d) in font file \"%s\"\n",
118	greg	2.1	err, gn, pathname);
119	greg	2.22	fclose(fp);
120			return(NULL);
121	greg	2.1	memerr:
122	greg	2.22	fprintf(stderr, "out of memory in getfont()\n");
123			fclose(fp);
124			return(NULL);
125	greg	2.1	}
126	greg	2.2
127
128	greg	2.12	void
129	greg	2.21	freefont( /* release a font (free all if NULL) */
130			FONT *fnt
131			)
132	greg	2.6	{
133			FONT head;
134	greg	2.21	FONT fl, f;
135			int i;
136	greg	2.12	/* check reference count */
137	schorsch	2.16	if (fnt != NULL && ((fnt->nref-- > 1) \| retainfonts))
138	greg	2.12	return;
139	greg	2.6	head.next = fontlist;
140			fl = &head;
141			while ((f = fl->next) != NULL)
142	schorsch	2.16	if ((fnt == NULL) \| (fnt == f)) {
143	greg	2.6	fl->next = f->next;
144			for (i = 0; i < 256; i++)
145			if (f->fg[i] != NULL)
146	greg	2.12	free((void *)f->fg[i]);
147			free((void *)f);
148	greg	2.6	} else
149			fl = f;
150			fontlist = head.next;
151			}
152
153
154	greg	2.2	int
155	greg	2.21	uniftext( /* uniformly space text line */
156			short sp, / returned character spacing */
157			char tp, / text line */
158			FONT f / font */
159			)
160	greg	2.3	{
161			int linelen;
162
163			linelen = *sp++ = 0;
164			while (*tp)
165			if (f->fg[*tp++&0xff] == NULL)
166			*sp++ = 0;
167			else
168	greg	2.10	linelen += *sp++ = 255;
169	greg	2.3	return(linelen);
170			}
171
172
173			int
174	greg	2.21	squeeztext( /* squeeze text line */
175			short sp, / returned character spacing */
176			char tp, / text line */
177			FONT f, / font */
178			int cis /* intercharacter spacing */
179			)
180	greg	2.2	{
181			int linelen;
182	greg	2.21	GLYPH *gp;
183	greg	2.2
184	greg	2.8	linelen = 0;
185	greg	2.2	gp = NULL;
186			while (tp && (gp = f->fg[tp++&0xff]) == NULL)
187			*sp++ = 0;
188			cis /= 2;
189	greg	2.8	*sp = cis;
190	greg	2.2	while (gp != NULL) {
191			if (gp->nverts) { /* regular character */
192			linelen += *sp++ += cis - gp->left;
193			*sp = gp->right + cis;
194			} else { /* space */
195			linelen += *sp++;
196	greg	2.3	*sp = f->mwidth;
197	greg	2.2	}
198			gp = NULL;
199			while (tp && (gp = f->fg[tp++&0xff]) == NULL) {
200			linelen += *sp++;
201			*sp = 0;
202			}
203			}
204	greg	2.3	linelen += *sp += cis;
205	greg	2.2	return(linelen);
206			}
207
208
209	greg	2.3	int
210	greg	2.21	proptext( /* space line proportionally */
211			short sp, / returned character spacing */
212			char tp, / text line */
213			FONT f, / font */
214			int cis, /* target intercharacter spacing */
215			int nsi /* minimum number of spaces for indent */
216			)
217	greg	2.2	{
218	greg	2.21	char end, tab = NULL;
219	greg	2.3	GLYPH *gp;
220			short *nsp;
221			int alen, len, width;
222			/* start by squeezing it */
223			squeeztext(sp, tp, f, cis);
224			/* now, realign spacing */
225	greg	2.7	width = *sp++;
226	greg	2.3	while (*tp) {
227	greg	2.7	len = alen = 0;
228	greg	2.3	nsp = sp;
229			for (end = tp; *end; end = tab) {
230			tab = end + 1;
231			alen += *nsp++;
232			if (f->fg[*end&0xff]) {
233			while ((gp = f->fg[*tab&0xff]) != NULL &&
234			gp->nverts == 0) { /* tab in */
235			alen += *nsp++;
236			tab++;
237			}
238			len += tab - end;
239			}
240	greg	2.4	if (nsi && tab - end > nsi)
241	greg	2.3	break;
242			}
243			len = f->mwidth + cis; / compute target length */
244			width += len;
245			len -= alen; /* necessary adjustment */
246			while (sp < nsp) {
247			alen = len/(nsp-sp);
248			*sp++ += alen;
249			len -= alen;
250			}
251			tp = tab;
252			}
253			return(width);
254	greg	2.2	}